Drill Index designed and machined by Adam Booth (Abom79). This very first Abom Original Product will be in very limited supply. Each are engraved with an individual serial number, anodized in OD Green and you can choose if it comes with or without a complete 29-piece set of Greenfield Industries screw machine length drills, style 157. Adam had meticulously designed and machined each one himself in his Milltronics mill and is happy to finally have a product manufactured in house to offer to his loyal followers. Thanks for all of your support of our small business.